noctbot/bot/src/commands/react.ts

import { client } from "../client";
import { getRepository } from "typeorm";
import { MessageReaction } from "@shared/db/entity/MessageReaction";
import { KnownUser } from "@shared/db/entity/KnownUser";
import { ReactionType, ReactionEmote } from "@shared/db/entity/ReactionEmote";
import { isAuthorisedAsync } from "../util";
import { CommandSet, Command, Action, ActionType } from "src/model/command";
import { Message } from "discord.js";

const pattern = /^react to\s+"([^"]+)"\s+with\s+\<:[^:]+:([^\>]+)\>$/i;

async function getRandomEmotes(allowedTypes: ReactionType[], limit: number) {
    let reactionEmotesRepo = getRepository(ReactionEmote);

    let a = await reactionEmotesRepo.query(`
        select distinct on (type) type, "reactionId"
        from
                (   select *
                    from reaction_emote
                    where type in (${allowedTypes.map((s, i) => `$${i + 1}`).join(",")})
                    order by random(), random() 
                    limit ${limit}
        ) as sub`, allowedTypes) as ReactionEmote[];

    return a;
}

@CommandSet
export class ReactCommands {

    @Command({ pattern: "react to", auth: true, documentation: {description: "React to <message> with <emote>.", example: "react to \"<message>\" with <emote>"} })
    async addReaction(msg: Message, s: string) {
        if (!await isAuthorisedAsync(msg.member))
            return;
        let contents = pattern.exec(s);

        if (contents != null) {
            let reactable = contents[1].trim().toLowerCase();
            let reactionEmoji = contents[2];

            if (!client.bot.emojis.cache.has(reactionEmoji)) {
                msg.channel.send(`${msg.author.toString()} I cannot react with this emoji :(`);
                return;
            }

            let repo = getRepository(MessageReaction);

            let message = repo.create({
                message: reactable,
                reactionEmoteId: reactionEmoji
            });
            await repo.save(message);

            msg.channel.send(`${msg.author.toString()} Added reaction!`);
        }
    }

    @Command({ pattern: "remove reaction to", auth: true, documentation: {description: "Stops reacting to <message>.", example: "remove reaction to <message>"} })
    async removeReaction(msg: Message, s: string) {
        if (!await isAuthorisedAsync(msg.member))
            return;

        let content = s.substring("remove reaction to ".length).trim().toLowerCase();
        let repo = getRepository(MessageReaction);
        let result = await repo.delete({ message: content });

        if (result.affected == 0) {
            msg.channel.send(`${msg.author.toString()} No such reaction available!`);
            return;
        }
        msg.channel.send(`${msg.author.toString()} Removed reaction!`);
    }

    @Command({ pattern: "reactions", documentation: {description: "Lists all known messages this bot can react to.", example: "reactions"} })
    async listReactions(msg: Message) {
        let reactionsRepo = getRepository(MessageReaction);

        let messages = await reactionsRepo.find({
            select: ["message"]
        });

        let reactions = messages.reduce((p, c) => `${p}\n${c.message}`, "");
        msg.channel.send(`I'll react to the following messages:\n\`\`\`${reactions}\n\`\`\``);
    }

    @Action(ActionType.MESSAGE)
    async reactToMentions(actionsDone: boolean, msg: Message, content: string) {
        if (actionsDone)
            return false;

        let lowerContent = content.toLowerCase();

        let reactionRepo = getRepository(MessageReaction);
        let usersRepo = getRepository(KnownUser);

        let message = await reactionRepo.findOne({ message: lowerContent });

        if (message) {
            let emoji = client.bot.emojis.resolve(message.reactionEmoteId);
            if (emoji)
                msg.react(emoji);
            return true;
        }

        if (msg.mentions.users.size == 0)
            return false;

        let knownUsers = await usersRepo.find({
            select: ["mentionReactionType"],
            where: [...msg.mentions.users.map(u => ({ userID: u.id }))]
        });

        if (knownUsers.length == 0)
            return false;

        let reactionEmoteTypes = new Set<ReactionType>();

        for (let user of knownUsers) {
            if (user.mentionReactionType == ReactionType.NONE)
                continue;
            reactionEmoteTypes.add(user.mentionReactionType);
        }

        if(reactionEmoteTypes.size == 0)
            return false;

        let randomEmotes = await getRandomEmotes([...reactionEmoteTypes], 5);

        if (randomEmotes.length == 0)
            return false;

        for (let emote of randomEmotes) {
            let emoji = client.bot.emojis.resolve(emote.reactionId);
            if(emoji)
                await msg.react(emoji);
        }

        return true;
    }

    @Action(ActionType.INDIRECT_MENTION)
    async reactToPing(actionsDone: boolean, msg: Message) {
        if (actionsDone)
            return false;
        let emoteType = ReactionType.ANGERY;

        let repo = getRepository(KnownUser);

        let knownUser = await repo.findOne({
            select: ["replyReactionType"],
            where: [{
                userID: msg.author.id
            }]
        });

        if (knownUser) {
            if (knownUser.replyReactionType == ReactionType.NONE)
                return false;
            emoteType = knownUser.replyReactionType;
        }

        let emotes = await getRandomEmotes([emoteType], 1);

        if (emotes.length != 1)
            return false;

        let emote = client.bot.emojis.resolve(emotes[0].reactionId);

        if (!emote) {
            console.log(`WARNING: Emote ${emotes[0]} no longer is valid. Deleting invalid emojis from the list...`);

            let emotesRepo = getRepository(ReactionEmote);
            await emotesRepo.delete({ reactionId: emotes[0].reactionId });
            return false;
        }

        msg.channel.send(emote.toString());
        return true;
    }
};